"Then, in 1902, the American company Hamilton Beach patented the first electric vibrator available for retail sale, making the vibrator the fifth domestic appliance to be electrified, after the sewing machine, fan, tea kettle, and toaster, and about a decade before the vacuum cleaner and electric iron.[2]"
For sure, the electric vibrator was a huge improvement over the coal fired steam vibrators, which, although they could vibrate with great vigor for extended periods of time, required a team of stokers and, if improperly handled, could run the boiler dry, overheat, and explode.
"Then, in 1902, the American company Hamilton Beach patented the first electric vibrator available for retail sale, making the vibrator the fifth domestic appliance to be electrified, after the sewing machine, fan, tea kettle, and toaster, and about a decade before the vacuum cleaner and electric iron.[2]"
http://en.wikipedia.org/wiki/Vibrator_%2…